Welti's manoeuvre, ileal passage below the mesocolon in extended left hemicolectomy, with peritonization: an old revised trick also useful also in the laparoscopic era – a video vignette. (15th March 2021) - Portale, Giuseppe; Mazzeo, Antonio; Zuin, Matteo; Spolverato, Ylenia Camilla; Cipollari, Chiara; Fiscon, Valentino